package sell;
import java.util.Scanner;
public class Example2_2 {
    static final float PI=3.14159f;
    public static void main(String[]args){
            Scanner sc=new Scanner(System.in);
            float radius=sc.nextFloat();
            System.out.println("圆的周长是："+2*PI*radius);
            System.out.println("圆的面积是："+PI*radius*radius);

    }
}
